20222100102221 has 4 divisors (see below), whose sum is σ = 20222109725532. Its totient is φ = 20222090478912.

The previous prime is 20222100102203. The next prime is 20222100102223. The reversal of 20222100102221 is 12220100122202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15390038844196 + 4832061258025 = 3923014^2 + 2198195^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222100102221 - 2³⁴ = 20204920233037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20222100102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222100102223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161726 + ... + 6361631.

It is an arithmetic number, because the mean of its divisors is an integer number (5055527431383).

Almost surely, 2^{20222100102221} is an apocalyptic number.

It is an amenable number.

20222100102221 is a deficient number, since it is larger than the sum of its proper divisors (9623311).

20222100102221 is an equidigital number, since it uses as much as digits as its factorization.

20222100102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9623310.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20222100102221 its reverse (12220100122202), we get a palindrome (32442200224423).

The spelling of 20222100102221 in words is "twenty trillion, two hundred twenty-two billion, one hundred million, one hundred two thousand, two hundred twenty-one".